diff --git a/dlls/dsdmo/dsdmo.idl b/dlls/dsdmo/dsdmo.idl
index 2eba0a4936e..30c54d0f889 100644
--- a/dlls/dsdmo/dsdmo.idl
+++ b/dlls/dsdmo/dsdmo.idl
@@ -65,3 +65,11 @@ coclass DirectSoundCompressorDMO {}
     vi_progid("Microsoft.DirectSoundChorusDMO")
 ]
 coclass DirectSoundChorusDMO {}
+
+[
+    uuid(efca3d92-dfd8-4672-a603-7420894bad98),
+    threading(both),
+    progid("Microsoft.DirectSoundFlangerDMO.1"),
+    vi_progid("Microsoft.DirectSoundFlangerDMO")
+]
+coclass DirectSoundFlangerDMO {}
diff --git a/dlls/dsdmo/main.c b/dlls/dsdmo/main.c
index 90e5ee9eb07..2393b92185e 100644
--- a/dlls/dsdmo/main.c
+++ b/dlls/dsdmo/main.c
@@ -1233,6 +1233,100 @@ static HRESULT chorus_create(IUnknown *outer, IUnknown **out)
     return S_OK;
 }
 
+struct dmo_flangerfx
+{
+    struct effect effect;
+    IDirectSoundFXFlanger IDirectSoundFXFlanger_iface;
+};
+
+static inline struct dmo_flangerfx *impl_from_IDirectSoundFXFlanger(IDirectSoundFXFlanger *iface)
+{
+    return CONTAINING_RECORD(iface, struct dmo_flangerfx, IDirectSoundFXFlanger_iface);
+}
+
+static HRESULT WINAPI flangerfx_QueryInterface(IDirectSoundFXFlanger *iface, REFIID iid, void **out)
+{
+    struct dmo_flangerfx *effect = impl_from_IDirectSoundFXFlanger(iface);
+    return IUnknown_QueryInterface(effect->effect.outer_unk, iid, out);
+}
+
+static ULONG WINAPI flangerfx_AddRef(IDirectSoundFXFlanger *iface)
+{
+    struct dmo_flangerfx *effect = impl_from_IDirectSoundFXFlanger(iface);
+    return IUnknown_AddRef(effect->effect.outer_unk);
+}
+
+static ULONG WINAPI flangerfx_Release(IDirectSoundFXFlanger *iface)
+{
+    struct dmo_flangerfx *effect = impl_from_IDirectSoundFXFlanger(iface);
+    return IUnknown_Release(effect->effect.outer_unk);
+}
+
+static HRESULT WINAPI flangerfx_SetAllParameters(IDirectSoundFXFlanger *iface, const DSFXFlanger *flanger)
+{
+    struct dmo_flangerfx *This = impl_from_IDirectSoundFXFlanger(iface);
+    FIXME("(%p) %p\n", This, flanger);
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI flangerfx_GetAllParameters(IDirectSoundFXFlanger *iface, DSFXFlanger *flanger)
+{
+    struct dmo_flangerfx *This = impl_from_IDirectSoundFXFlanger(iface);
+    FIXME("(%p) %p\n", This, flanger);
+    return E_NOTIMPL;
+}
+
+static const struct IDirectSoundFXFlangerVtbl flanger_vtbl =
+{
+    flangerfx_QueryInterface,
+    flangerfx_AddRef,
+    flangerfx_Release,
+    flangerfx_SetAllParameters,
+    flangerfx_GetAllParameters
+};
+
+static struct dmo_flangerfx *impl_flanger_from_effect(struct effect *iface)
+{
+    return CONTAINING_RECORD(iface, struct dmo_flangerfx, effect);
+}
+
+static void *flanger_query_interface(struct effect *iface, REFIID iid)
+{
+    struct dmo_flangerfx *effect = impl_flanger_from_effect(iface);
+
+    if (IsEqualGUID(iid, &IID_IDirectSoundFXFlanger))
+        return &effect->IDirectSoundFXFlanger_iface;
+    return NULL;
+}
+
+static void flanger_destroy(struct effect *iface)
+{
+    struct dmo_flangerfx *effect = impl_flanger_from_effect(iface);
+
+    free(effect);
+}
+
+static const struct effect_ops flanger_ops =
+{
+    .destroy = flanger_destroy,
+    .query_interface = flanger_query_interface,
+};
+
+static HRESULT flanger_create(IUnknown *outer, IUnknown **out)
+{
+    struct dmo_flangerfx *object;
+
+    if (!(object = calloc(1, sizeof(*object))))
+        return E_OUTOFMEMORY;
+
+    effect_init(&object->effect, outer, &flanger_ops);
+    object->IDirectSoundFXFlanger_iface.lpVtbl = &flanger_vtbl;
+
+    TRACE("Created flanger effect %p.\n", object);
+    *out = &object->effect.IUnknown_inner;
+    return S_OK;
+}
+
 struct class_factory
 {
     IClassFactory IClassFactory_iface;
@@ -1320,6 +1414,7 @@ class_factories[] =
     {&GUID_DSFX_STANDARD_ECHO,          {{&class_factory_vtbl}, echo_create}},
     {&GUID_DSFX_STANDARD_COMPRESSOR,    {{&class_factory_vtbl}, compressor_create}},
     {&GUID_DSFX_STANDARD_CHORUS,        {{&class_factory_vtbl}, chorus_create}},
+    {&GUID_DSFX_STANDARD_FLANGER,       {{&class_factory_vtbl}, flanger_create}},
 };
 
 HRESULT WINAPI DllGetClassObject(REFCLSID clsid, REFIID iid, void **out)
diff --git a/dlls/dsdmo/tests/dsdmo.c b/dlls/dsdmo/tests/dsdmo.c
index 9eb43c884c3..369e02aeaa4 100644
--- a/dlls/dsdmo/tests/dsdmo.c
+++ b/dlls/dsdmo/tests/dsdmo.c
@@ -415,11 +415,14 @@ static void test_flanger_parameters(void)
 
     hr = CoCreateInstance(&GUID_DSFX_STANDARD_FLANGER, NULL, CLSCTX_INPROC_SERVER,
             &IID_IDirectSoundFXFlanger, (void **)&flanger);
-    todo_wine ok(hr == S_OK, "Got hr %#lx.\n", hr);
+    ok(hr == S_OK, "Got hr %#lx.\n", hr);
     if (hr != S_OK)
         return;
 
     hr = IDirectSoundFXFlanger_GetAllParameters(flanger, &params);
+    todo_wine ok(hr == S_OK, "Got hr %#lx.\n", hr);
+    if (hr != S_OK)
+        return;
     ok(hr == S_OK, "Got hr %#lx.\n", hr);
     ok(params.fWetDryMix == 50.0f, "Got %.8e%% wetness.\n", params.fWetDryMix);
     ok(params.fDepth == 100.0f, "Got %.8e * 0.01%% depth.\n", params.fDepth);
@@ -551,7 +554,7 @@ START_TEST(dsdmo)
         {&GUID_DSFX_STANDARD_COMPRESSOR,    &IID_IDirectSoundFXCompressor},
         {&GUID_DSFX_STANDARD_DISTORTION,    &IID_IDirectSoundFXDistortion, TRUE},
         {&GUID_DSFX_STANDARD_ECHO,          &IID_IDirectSoundFXEcho},
-        {&GUID_DSFX_STANDARD_FLANGER,       &IID_IDirectSoundFXFlanger, TRUE},
+        {&GUID_DSFX_STANDARD_FLANGER,       &IID_IDirectSoundFXFlanger},
         {&GUID_DSFX_STANDARD_GARGLE,        &IID_IDirectSoundFXGargle, TRUE},
         {&GUID_DSFX_STANDARD_I3DL2REVERB,   &IID_IDirectSoundFXI3DL2Reverb},
         {&GUID_DSFX_STANDARD_PARAMEQ,       &IID_IDirectSoundFXParamEq},